How to use drivers in order to allow a rotation of an object in the x axis to be mirrored as a rotation in the y axis?
Hover on the y rot value, right click and choose &quot;copy as new driver&quot;, then hover on the z rot value and right click &quot;paste driver&quot;.
Then you can choose &quot;edit driver&quot; to change the math if needed.
Remember that thoose values ar local, and it's a good habit to apply (Ctrl A) rot and scale to any object before starting animations and simulations.